Air valve for carburetors



April 2, 11929, B IT H,7@7,942

AIR VALVE FOR CARBURETORS I Filed April 11, 1927 INVENTOR ATTORNEY Patented Apr. 2, 1929.

warren stares marten PATENT I @IFFHCGE.

HENRY n. rnrr'r, or nn'rnorr, raronreen, nssrenon 'ro enonen in. nouns, or

DETROIT, MICHIGAN.

AIR VALVE FOR CARB'URETORS.

Application filed April 11,

The object of this invention is to provide a simple weighted air valve which will not requirea dash pot to prevent pulsation. Other objects are to provide an air valve which will providethe intensified compensation which is necessary to ensure steady low speed running when no bypass is provided around the throttle.

Another object is to provide an air valve which will, at wide open throttle, offer a minimum resistance to the air flow, so that-the carburetor operates practically as a plain tube carburetor. Finally, theobject is to obtain at intermediate throttle positions (when the car is being driven through the driving range) the necessary minimum fuel consumption, without which a carburetor is unsalable.

vices operated by the throttle, and known as This intermediate lean mixture has heretofore been usually obtained by mechanical deeconomizers. The defect of such throttle controlled economizers is that they come into operation at. a definite throttle position, whereas an air valve gives a definitely richer 'rnixture during the period immediately after the opening of the throttle, that is during the time the engine is accelerating.

However, the chief object of this invention is to provide an air valve in which the air flow itself automatically stabilizes the air valve at high air velocity, eliminating the need for a dash pot.

Figure 1 shows the air valve applied to avaporizer of the type. in which a hot rich mixture is diluted with cold air.

Figure 2 is a cross section on section 2-2v of Figure 3.

Figure 3 is a partial sectional plane 33 of Figure 1.

- Figure 4 shows an alternative construction. In the figures, A is the air entrance, B is the air valve, C is the stop limiting the opening movement of the air valve. 'D is the starting (choke) valve, E is the .Venturi tube mixing chamber. F is the entrance for the elevation on hot'rich mixture into the mixing chamber E.

G is the throttle valve located in the mixture outlet. J J are the pivots or supports for the air valve B. K is the distance this support is located below center. L is the width of the widest portion of the air'valve. lln the preferred construction I have "found that with a valve 1.283 dia, K:.04:6, and L=13/16' ,"that these proportions give the ly opens graduall 1927. Serial a... 182,643.

above described result. The angle M, which is the angle the bottom face of the air valve B makes with the horizontal, T have found should be 25. The importance of these inclined flat surfaces in ensuring stability is emphasized. The clearance between" the valve B and the air entrance A should be .015 all around, or'.030"- in diameter, in order that there should be 1" depression in F on idling. p

It will be noted (see Fig. 1) that the widest portion of the air valve assumes a position which ofiers the least obstruction when the air flow is greatest. That is to say, the air valve is more or less stream lined, the thin edge facing down stream, although obviously a coil spring could be substituted for gravity or to assist the force of gravity.

In Figure 4: theair valve B has been more turi E. removed so that the stream lined air valve itself will take its place and forms a mixing chamber of somewhat venturi form, but the flat faces on the upstream side of the air valve are retained.

0pemti0n.Tn Figures 1, 2, and 3, when the engine is idling, the air valve B is sub stantially in a vertical position when the throttle G is opened and the depression in F increases above 1" of water thevalve B slowadmitting more air. When the throttle is thrown wide open the valve B takes the position shown in "Figure 1. When it is in this position, if it is moved out of'the position shown it immediately returns to this position. That is to say, it is positively held in a position parallel to the air'stream, and may be said to be in a position of stable equilibrium.

What I claim is 1. In a carburetor, an air passage, a wedgeshaped weighted air valve pivotally supported in the air stream and adapted to take aposition parallel to the air stream when the air valve is at maximum with the thinner edge of the air valve facing down stream.

2. lin a carburetor, an air passage, a wedge-shaped weighted air valve pivotally supported in the air stream and adapted to take a position parallel to the air stream when the air, valve is at maximum with the thinner edge of the air valve facing down stream, the bottom of said air valve being bounded by two fiat surfaces symmetrically inclined to the axis of said air valve.

3. In a carburetor,an air passage, a wedgeshaped air valve pivotally supported in the air stream-0n a horizontal axis, so that the greater portion of the surface is located above said axis, and the greater mass ofthe air valve is located below the said axisythe bottom of the valve being Wedge-shaped, Whereis at a maximum and. automatically takes av position substantially normal the air velocity when the air flow is at a mlnimum.

lln testimony whereof ll afiix my signature. 

